An eccentric wheel.
An example of eccentric is the orbit of Mercury.
An example of eccentric is an adult wearing footy pajamas to a formal dinner.
"The recluse has become really eccentric over the years."
Origin of eccentric
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle French excentrique, from Medieval Latin excentricus, from Ancient Greek ἔκκεντρος (ekkentros, “not having the earth as the center of an orbit”), from ἐκ (ek, “out”) + κέντρον (kentron, “point”)